<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>画线</title>
    <style>
        body {margin: 0;}
        #canvas_wrapper{width: 100%; height: calc(100vh); }
    </style>
</head>
<body>
<div id="canvas_wrapper"></div>
<script src="index.ts" type="module"></script>
</body>
</html>
